Email providers signify that non-delivery of your emails using bounces. There are a number of reasons why your email bounces, but this article concerns hard bounces.

<aside> 💡 A hard bounce occurs when an email receiver permanently rejects a message because the email address is invalid or doesn't exist.

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Sendloop monitors every hard bounce originating from email campaigns associated with your account. In addition, Sendloop makes note of any spam complaints, as well the opt-out rates, related to your account.

If you hard bounce rate exceeds 0.5%, we will flag your account for activity expressly forbidden by our anti-spam policy.

Ways to Lower Your Hard Bounce Rate

To reduce your hard bounce rate, you can:

• Use your own email lists: Never use a third-party email list, since you aren't in control of how the email addresses were procured
• Enable double opt-in: Whenever someone subscribes to your list, send a confirmation email that requires action on the user's part. This does double-duty by ensuring that the email address you've received is valid and the user wants to receive your emails.
• Maintain good email list hygiene: Use an email list verification service (such as Kickbox or Hunter if you're targeting an email campaign toward an old/passive subscriber list. This will remove invalid emails, as well as non-responders, from your lists.